Sewing machine



FIG. 1 is a front view of a sewing machine showing my new design;

FIG. 2 is a back view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a front, left perspective view thereof;

FIG. 6 is a front, right perspective view thereof;

FIG. 7 is a back, left perspective view thereof; and,

FIG. 8 is a back, right perspective view thereof. 

The ornamental design for a sewing machine, as shown and described. 